Spin transport and tunable Gilbert damping in a single-molecule magnet junction

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Physical Review B. 2013, 87(4). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.87.045426
Zusammenfassung

We study time-dependent electronic and spin transport through an electronic level connected to two leads and coupled with a single-molecule magnet via exchange interaction. The molecular spin is treated as a classical variable and precesses around an external magnetic field. We derive expressions for charge and spin currents by means of the Keldysh nonequilibrium Green’s functions technique in linear order with respect to the time-dependent magnetic field created by this precession. The coupling between the electronic spins and the magnetization dynamics of the molecule creates inelastic tunneling processes which contribute to the spin currents. The inelastic spin currents, in turn, generate a spin-transfer torque acting on the molecular spin. This back-action includes a contribution to the Gilbert damping and a modification of the precession frequency. The Gilbert damping coefficient can be controlled by the bias and gate voltages or via the external magnetic field and has a nonmonotonic dependence on the tunneling rates.

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ISO 690FILIPOVIC, Milena, Cecilia HOLMQVIST, Federica HAUPT, Wolfgang BELZIG, 2013. Spin transport and tunable Gilbert damping in a single-molecule magnet junction. In: Physical Review B. 2013, 87(4). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.87.045426
BibTex
@article{Filipovic2013trans-22479,
  year={2013},
  doi={10.1103/PhysRevB.87.045426},
  title={Spin transport and tunable Gilbert damping in a single-molecule magnet junction},
  number={4},
  volume={87},
  issn={1098-0121},
  journal={Physical Review B},
  author={Filipovic, Milena and Holmqvist, Cecilia and Haupt, Federica and Belzig, Wolfgang}
}
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